JP2016206143A - Regulation system of immersion-type water level measurement device, regulation method of the same, regulation program of the same and immersion-type water level measurement device with regulating function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a regulation technique of an immersion-type water level measurement device capable of performing highly accurate correction with respect to an indicated value of a water level even when a density gradient occurs in liquid being a measuring object of the water level.SOLUTION: A regulation system 10 comprises: three or more water pressure measuring instruments 50fixed on an outer surface of a detector (detection section 24, transmission line 29) immersed into storage liquid at different water depths; a density derivation section 47 for deriving two or more density of the liquid on the basis of mutual differences among measured water pressures Pmeasured by at least three of the water pressure measuring instruments 50and water depth differences of the water pressure measuring instruments 50; a density averaging section 49 for averaging the two or more density derived by the density derivation section 47 and driving average density of the liquid; and a correction section 48 for correcting an indicated value of a water level of the liquid on the basis of the average density.SELECTED DRAWING: Figure 4

Description

  The present embodiment relates to a technique for adjusting the indicated value of the water level indicated by the throwing water level gauge.

  In facilities that have become difficult to enter, such as nuclear power plants damaged by tsunamis and earthquakes, it is sometimes required to measure the water level of the liquid inside. As a conventionally known water level meter, there is a bubble type water level meter that calculates a water level by measuring a pressure required to send bubbles to the bottom of the water with a bubbler tube having an open end arranged at the bottom of the water.

  The bubble-type water level meter is a water level meter that slowly blows out bubbles from a tube opened in water and measures the pressure in the tube at that time with a sensor. Since the pressure in the pipe is equal to the sum of the atmospheric pressure and the water pressure applied to the open end of the pipe, the water level can be obtained by subtracting the atmospheric pressure from the pressure at the open end.

The bubble-type water level meter requires an air supply source for sending bubbles to the bottom of the water, and the apparatus becomes large. In addition, installation work for fixing the device in the vicinity of the liquid is required.
One type of water level gauge that does not require such installation work is the throw-in type water level gauge. The throw-in type water level gauge is smaller and easier to operate than the bubble type water level gauge. This throw-in type water level gauge is widely used in river monitoring systems and water level measurement systems such as water and sewage systems in general industries.
In addition, a throw-in type water level meter has been proposed that is easier to set up and maintain and can measure the water level more stably.

By the way, the water level displayed by the throwing water level gauge may deviate from the true water level due to several factors.
For example, when the water level is derived based on the water pressure, if the density of the stored liquid is higher than the specific gravity 1, the water level is displayed as deeper than the actual level.
In addition, the indicated value of the water level may become inaccurate due to a mechanical shift inside the water level gauge.
Therefore, in order to improve the accuracy of the indicated value of the water level calculated by the throw-in type water level gauge, it is necessary to correct for each factor of deviation.

  The request for accuracy of the indicated value of the water level is required even when the above-mentioned workers cannot enter the site. Currently, research is being conducted on water level gauges that can obtain accurate water levels even when remotely corrected.

Japanese Patent Application Laid-Open No. 07-054394 JP 2000-337945 A No. 03-2821

However, in the above-described conventional technology, when correction based on the density of the liquid to be stored is performed, there is a problem that accurate correction cannot be performed when the liquid has a density gradient.
In other words, if a density gradient that can be generated in the depth direction occurs when the stored liquid is not uniform, the density acquired for correcting the indicated value of the water level may differ from the density of the entire liquid depending on the acquired water depth. There are things to do.
In such correction using a density that deviates from the density of the entire liquid, the indicated value of the water level cannot be matched with the true water level with high accuracy.

  The embodiment of the present invention has been made in consideration of such circumstances, and even when a density gradient occurs in the liquid to be measured for the water level, it is possible to highly accurately correct the indicated value of the water level. It is an object of the present invention to provide an adjustment system for an input water level gauge, an adjustment method thereof, an adjustment program thereof, and an input water level gauge with an adjustment function.

  The adjustment system of the throw-in type water level meter according to the present embodiment includes three or more water pressure measuring devices fixed at different water depths to the outer surface of the detector thrown into the stored liquid, and at least three of the water pressure measuring devices. The density deriving unit for deriving two or more liquid densities based on the difference between the measured water pressures measured by one and the difference in the water depth of the water pressure measuring device, and the two or more densities derived by the density deriving unit are averaged A density average part for deriving the average density of the liquid and a correction part for correcting the indicated value of the liquid level based on the average density are provided.

  Moreover, the throw-in type water level meter with an adjustment function according to the present embodiment includes a step of fixing three or more water pressure measuring devices at different water depths on the outer surface of the detector thrown into the stored liquid, A step of deriving two or more liquid densities based on a difference between measured hydraulic pressures measured in at least three and a difference in water depth of a hydrometer, and averaging the derived two or more densities to obtain an average liquid density And a step of correcting the indicated value of the liquid water level based on the average density.

  Moreover, the adjustment program of the throwing water level meter according to the embodiment includes a step of fixing three or more water pressure measuring devices at different water depths to the outer surface of the detector thrown into the stored liquid in the computer, A step of deriving two or more liquid densities based on a difference between measured water pressures measured by at least three of them and a difference in water depth of a water pressure measuring device, and averaging the derived two or more densities to obtain an average liquid density And a step of correcting the indicated value of the liquid level based on the average density.

  According to the present embodiment, even when a density gradient occurs in the liquid whose water level is to be measured, the adjustment system for the input water level gauge capable of highly accurate correction to the indicated value of the water level, its adjustment method, An adjustment program and an adjustable water level gauge are provided.

The schematic block diagram of the throwing-type water level meter which the adjustment system of the throwing-type water level meter concerning 1st Embodiment makes object. The schematic sectional drawing of the detection part with which the throw-in type water level meter concerning a 1st embodiment is provided. The figure which shows the correspondence of the differential pressure | voltage of each pressure concerning a reference | standard pressure side diaphragm and a water pressure side diaphragm, and the indication value of the water level displayed on a display part. The schematic block diagram of the adjustment system of the throw-in type water level meter concerning 1st Embodiment. The figure which shows the detection part equipped with four water pressure measuring devices. The figure which shows an example of the display part of the specification corresponding to the adjustment system of the throw-in type water level meter concerning 1st Embodiment. The schematic structure figure of the member in which the adjustment system of the throw-in type water level meter concerning the 1st embodiment and the throw-in type water level meter are installed permanently. The flowchart which shows the adjustment method of the throw-in type water level meter concerning 1st Embodiment. Explanatory drawing of the adjustment method of the throw-in type water level meter concerning 2nd Embodiment.

Hereinafter, embodiments of the present embodiment will be described with reference to the accompanying drawings.
[Pitching water level gauge 20]
First, an input water level meter 20 to which an adjustment system 10 for an input water level meter (hereinafter simply referred to as “adjustment system 10”) is applied will be described with reference to FIGS. 1 and 2 (see FIG. 4 as appropriate). .
FIG. 1 is a schematic configuration diagram of a throw-in water level gauge 20 targeted by the adjustment system 10 according to the first embodiment.

As shown in FIG. 1, in the throw-in type water level gauge 20, the detection unit 24 thrown into the liquid is connected to the conversion unit 32 via a transmission line 29 and a signal line 38.
The conversion part 32 is connected to the display part 26 inside the central control room 41, for example.
The conversion unit 32 performs I / V conversion on the current signal related to the water level of the liquid received from the detection unit 24 and transmits the current signal to the display unit 26.

FIG. 2 is a schematic cross-sectional view of the detection unit 24 provided in the throwing water level gauge 20.
As shown in FIG. 2, the detection unit 24 has a cylindrical outer shape due to the casing 21 in which the water inlet 33 is provided on one bottom surface.
Inside the housing 21, a pressure sensor 22 is installed in the vicinity of the bottom surface where the water inlet 33 is provided so as to seal the housing 21.
The inside of the housing 21 is isolated from the surrounding liquid by the pressure sensor 22, and no liquid enters the inside further from the pressure sensor 22.

On the other hand, the hollow cable 23 is connected to the other bottom surface where the water inlet 33 is not provided. The hollow cable 23 is normally open to the atmosphere at the other end to which the casing 21 is not connected, and maintains the inside of the casing 21 at the atmospheric pressure _Patm . One surface of the pressure sensor 22 facing the inside of the sealed casing 21 receives the atmospheric pressure _Patm via the hollow cable 23.

The other surface in contact with the liquid of the pressure sensor 22 is subjected to a pressure P _w. As the pressure sensor 22, for example, a sensor using a diaphragm 25 that converts the pressure applied to the diaphragm into the magnitude of an electric signal is widely used.
Hydraulically P _w received by the water pressure side diaphragm 25a having a pressure sensor 22, differential pressure ΔP between the atmospheric pressure P _atm to the reference pressure side diaphragm 25b is subjected via a hollow cable 23 is read and is converted to a voltage in the differential unit 35 .

This voltage is converted into a current signal by the V / I conversion circuit 37 and output to the signal line 38. The signal line 38 is covered with the covering material 28 together with the hollow cable 23 and the reinforcing wire 18, and is connected to the conversion unit 32 (FIG. 1).
The conversion unit 32 performs I / V conversion on the current signal received from the detection unit 24 via the signal line 38 and transmits the current signal to the display unit 26 (FIG. 1).

Here, FIG. 3 is a diagram illustrating a correspondence relationship between the pressure difference ΔP of each pressure applied to the reference pressure side diaphragm 25b and the water pressure side diaphragm 25a and the water level indication value displayed on the display unit 26.
The display unit 26 displays an electric signal based on the differential pressure ΔP transmitted from the conversion unit 32 as a water level (36.4 m in FIG. 3) of the liquid (in the case of a liquid having a specific gravity of 1).

However, since the indication value of the water level is calculated based on the pressure such as the water pressure _Pw as described above, it may not completely match the actual water level.
For example, if the density of the liquid increases depending on the type of liquid stored, the water pressure _Pw increases, and therefore the water level is displayed as deeper than the actual level.
The adjustment system 10 (FIG. 4) corrects the indication value of the water level on the display unit 26 to obtain an accurate indication value.

  The term “indicated value” used is not limited to those visually recognized by an operator, but means any value recognized as a water level by the throwing water level gauge 20. However, in each embodiment, the adjustment regarding the indication value of the water level displayed on the display unit 26 will be described as an example.

(First embodiment)
[Adjustment system 10]
FIG. 4 is a schematic configuration diagram of the adjustment system 10 according to the first embodiment.
FIG. 5 is a diagram showing the detection unit 24 equipped with four water pressure measuring devices 50 (immersed members 51).
As shown in FIG. 4, the adjustment system 10 according to the first embodiment includes a water pressure measuring device 50, a designation unit 43, a density derivation unit 47, a density average unit 49, and a correction unit 48.

In order to derive a plurality of densities σ _n (σ _{1 to} σ ₃ ) at a plurality of water depths, three or more water pressure measuring devices 50 are attached as shown in FIG. Each of the water pressure measuring devices 50 _n (50) measures the back pressure by applying pressure to the bubbler tube 51 _n (immersed member 51 _n ) and the bubbler tube 51 _n (51) made of, for example, silicon or metal. The measuring unit 53 _n (53) (FIG. 4).

Hereinafter, as shown in FIGS. 4 and 5, an example in which the adjustment system 10 is provided with _four water pressure measuring devices 50 _n (50 ₁ to 50 ₄ ) will be described.
The bubbler tubes 51 _n (51 _{1 to} 51 ₄ ) are fixed by a jig 39 so that the opening ends 27 have different water depths on the outer surfaces of the transmission line 29 and the detection unit 24 constituting the detector.
The other free end of the bubbler tube 51 _n (51 _{1 to} 51 ₄ ) that opens into the atmosphere is connected to the corresponding measurement unit 53 _n (53 _{1 to} 53 ₄ ) on the ground.

The measuring unit 53 _n (53 _{1 to} 53 ₄ ) pressurizes the connected bubbler tube 51 and measures the back pressure received in reverse, so that the water pressure P _n (P _{1 to} P at the open end 27 of the bubbler tube 51 is measured. ₄ ) Get.
These measuring units 53 _n are all connected to the density deriving unit 47 through the specifying unit 43.
The designation unit 43 operates among all the measurement units 53 _n (53 _{1 to} 53 ₄ ), and operates three or more measurement units 53 that measure the water pressure P _n used to derive the density σ _n (σ _{1 to} σ ₃ ). For example, _n is designated according to the selection by the worker.

Here, FIG. 6 is a diagram illustrating an example of the display unit 26 having specifications corresponding to the adjustment system 10 according to the first embodiment.
On the display unit 26 is, for example, the operator, the measuring unit 53 _n to run (hereinafter, referred to as "operation measuring section 53 _n") instrument selection button 34 to specify is provided.

Hereinafter, in FIG. 4, description will be made assuming that all the measurement units 53 _n (53 _{1 to} 53 ₄ ) are designated by the designation unit 43.
The operation measuring unit 53 _n (53 _{1 to} 53 ₄ ) designated by the worker by selection is connected to the correction unit 48 and the density deriving unit 47 via the designation unit 43.

And the operation measurement part 53 _n measures the water pressure P _n at the water depth of the open end 27 of the bubbler tube 51 (51 _{1 to} 51 ₄ ) that is operated and connected. The measured water pressure P _n (P _{1 to} P ₄ ) is converted into an electric signal in magnitude and transmitted to the density deriving unit 47.
Based on the difference between the water pressure P _n and the water pressure P _{n + 1} and the water depth difference L _n (L _{1 to} L ₄ ) of the opening end 27, the density deriving unit 47 calculates the liquid density σ represented by Expression (1). _n (σ _{1 to} σ ₃ ) is derived.
σ _n = (| P _n −P _{n + 1} | / g) / L _n (1)
However, g represents a gravitational acceleration.

Information on the derived density σ _n (σ _{1 to} σ ₃ ) is transmitted to the density average unit 49. The density average unit 49 derives the average density σ _{ave of the} liquid by averaging the _three densities σ _n (σ _{1 to} σ ₃ ) derived by the density deriving unit 47.

The average density σ _ave thus derived is displayed on the display unit 26 and transmitted to the correction unit 48.
The correction unit 48 corrects the indicated value of the water level using the average density σ _{ave according} to the following equation (2).
L _k = (| P _w −P _atm | / g) / σ _ave (2)
However, L _k is the true water depth of the pressure sensor 22.
The correction may be reflected manually by providing a density correction button 48a (48) on the display unit 26.
Thus, according to the regulation system 10, by averaging to derive the pressure P _n (P ₁ ~P ₄₎ 2 or more from σ _n (σ ₁ ~σ ₃₎ at three or more depths, the water level Even when a density gradient occurs in the liquid to be measured, it is possible to perform highly accurate correction on the indicated value of the water level.

[Adjustment method]
Next, the adjustment method according to the first embodiment will be described with reference to the flowchart of FIG. 8 (refer to FIGS. 4, 5 and 7 as appropriate).
FIG. 7 is a schematic configuration diagram of members that are permanently installed in the adjustment system 10 and the throw-in water level gauge 20 according to the first embodiment.

  The target water level gauge 20 has a detection unit 24 sinking to the bottom of a structure storing a liquid whose water level is detected. A plurality of bubbler tubes 51 are installed in the detection unit 24 with the open ends 27 fixed to the outer surface of the detection unit 24, respectively. The free end of the bubbler tube 51 is connected to the repeater 13. The hollow cable 23 is opened to the atmosphere in the repeater 13.

  On the other hand, the signal line 38 is connected to the conversion unit 32 by the extension signal line 38 a even when not being corrected, and transmits the detected electric signal of the differential pressure ΔP to the conversion unit 32. The electrical signal received by the conversion unit 32 is sent to the display unit 26 installed in the central control room 41 or the like, and is monitored by the worker as the water level.

First, the adjustment system 10 is connected to such an input water level gauge 20 (S11).
Specifically, first, an operator connects the extended bubbler tube 52 to the repeater 13 and connects various members such as the bubbler tube 51 and the measuring unit 53.
However, the adjustment system 10 once connected may remain connected, and step S11 may be omitted for the second time and thereafter.

Next, the designation | designated part 43 designates the water pressure measuring device 50 which operates 3 or more among the installed water pressure measuring devices 50 (S12). As described above, the measuring device selection button 34 may be provided on the display unit 26 and the operator may select the button, but the designation unit 43 may automatically select it. The four water pressure measuring devices 50 specified by the selection are activated to measure the water pressures P _n (P _{1 to} P ₄ ) at the respective water depths.
The operation measuring unit 53 _n (53 _{1 to} 53 ₄ ) pressurizes the bubbler tubes 51 _n (51 _{1 to} 51 ₄ ) connected thereto until bubbles are leaked from the open ends 27 thereof.

By this pressurization, the operation measuring unit 53 _n receives a back pressure from the bubbler tube 51 (51 _{1 to} 51 ₄ ).
The back pressure applied to each bubbler tube 51 _n connected to the operation measuring unit 53 _n is measured as the water pressure P _n (P _{1 to} P ₄ ) at the water depth of the opening end 27.

Next, the density deriving unit 47 derives the density σ _n of the liquid at each water depth from the mutual difference of the measured water pressure P _n (measured water pressure) and the water depth difference L _n based on the equation (1) (S14). ).
Then, the average density σ _ave is derived by the density average unit 49 (S15).
The value of the average density σ _ave is displayed on the display unit 26 and transmitted to the correction unit 48.
Next, the correction unit 48 corrects the indicated value of the water level by the equation (2) using the average density σ _ave derived by the density average unit 49, and ends the operation (S16: END).

  As described above, according to the adjustment system 10 and the adjustment method according to the first embodiment, even when a density gradient occurs in the liquid to be measured for the water level, the water level indication value is corrected with high accuracy. can do.

(Second Embodiment)
FIG. 9 is an explanatory diagram of an adjustment method according to the second embodiment.

In the adjustment system 10 according to the second embodiment, as shown in FIG. 9, the density deriving unit 47 calculates the density σ _n at a specific water depth from the density σ _k (k ≠ n) at other water depths.
For example, when (1) is used as in the first embodiment, the density σ ₁ of the layer in the section between the first bubbler tube 51 ₁ and the second bubbler tube 51 ₂ is expressed by the following equation (3). become.
σ ₁ = (| P ₁ −P ₂ | / g) / L (3)

However, the density increases rapidly after a specific water depth because a liquid with a particularly high specific gravity is included, and the density σ _{n at} each water depth may not be proportional to the water depth. In this case, the density σ ₁ derived by the equation (3) does not represent the density of this section.
Further, when the water depth difference L between the first bubbler tube 51 ₁ and the second bubbler tube 51 ₂ is small, the value of | P ₁ −P ₂ | which is the water pressure difference is small, and the influence of the error of σ ₁ becomes large. .

In this case, it is desirable to obtain the density σ ₁ in this section indirectly, not directly from | P ₁ −P ₂ |. Therefore, attention is paid to the fact that the relational expressions expressed by the following expressions (4) to (10) hold.
In order to facilitate calculation, the opening ends 27 are assumed to be arranged at equal intervals L below. However, even if the interval is not equal, only the coefficient changes and the same relational expression holds. In order to facilitate understanding, a case will be described where the number of bubbler tubes 51 _n is five as shown in FIG.

First, the relationship between the water pressure P ₁ applied to the opening end 27 of the first bubbler tube 51 ₁ and the water pressure P _n (P _{2 to} P ₅ ) applied to the opening end 27 of the other bubbler tubes 51 _n (51 _{2 to} 51 ₅ ). about,
P ₁ −P ₂ = σ ₁ Lg (4)
P ₁ −P ₃ = σ _1-3 2Lg (5)
P ₁ −P ₄ = σ _1-4 3Lg (6)
P ₁ −P ₅ = σ _1-5 4Lg (7)
Holds.

Further, the relationship between the water pressure P ₂ applied to the opening end 27 of the second bubbler tube 51 ₂ and the water pressure P _n (P _{3 to} P ₅ ) applied to the opening end 27 of the other bubbler tubes 51 (51 _{3 to} 51 ₅ ). ,
P ₂ −P ₃ = σ ₂ Lg (8)
P ₂ −P ₄ = σ _2-4 2Lg (9)
P ₂ −P ₅ = σ _2-5 3Lg (10)
Holds.

Therefore,
From the relationship with (5)-(4), (8),
σ ₁ = 2σ _1-3 −σ ₂ (11)
From the relationship with (6)-(4), (9),
σ ₁ = 3σ _1-4 -2σ _2-4 (12)
From the relationship with (7)-(4), (10),
σ ₁ = 4σ _1-5 -3σ _2-5 (13)
Holds.

If derive the density sigma ₁ with either of these formulas (11) to (13), it is possible to obtain the density sigma ₁ representing the depth interval. Further, the density σ ₁ derived from the equations (11) to (13) may be averaged to obtain the density σ ₁ .
Thus, the number of density sigma _n derived from relational expression with other density σ _{k (k} ≠ n), the density was directly derived as shown in the first embodiment σ _{k (k} ≠ n) is The density is averaged at the density averaging unit 49 as in the first embodiment.

The second embodiment has the same structure and operation procedure as the first embodiment except that the density σ _n of a specific section is derived from the relational expression with other densities σ _k (k ≠ n). A duplicate description is omitted.
Also in the drawings, portions having a common configuration or function are denoted by the same reference numerals, and redundant description is omitted.

As described above, according to the adjustment system 10 and the adjustment method according to the second embodiment, the density σ _n of a specific section is derived from the relational expression with the density σ _k (k ≠ n) of other sections. The average density σ _ave more accurately representing the density of the entire liquid can be obtained.

  According to the adjustment system 10 of at least one embodiment described above, even when a density gradient occurs in the liquid to be measured for the water level, it is possible to correct the water level instruction value with high accuracy.

Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention.
These embodiments can be implemented in various other forms, and various omissions, replacements, changes, and combinations can be made without departing from the scope of the invention.
These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 ... Adjustment system (adjustment system) of throwing water level meter, 13 ... Repeater, 18 ... Reinforcement line, 20 ... Throwing water level meter, 21 ... Housing, 22 ... Pressure sensor, 23 ... Hollow cable, 24 ... Detection part, 25 ... Diaphragm, 25a ... Hydraulic pressure side diaphragm, 25b ... Reference pressure side diaphragm, 26 ... Display part, 27 ... Opening end, 28 ... Covering material, 29 ... Transmission line, 32 ... Conversion part, 33 ... Inlet hole, 34 ... Measuring instrument selection button, 35 ... Difference part, 37 ... V / I conversion circuit, 38 ... Signal line, 38a ... Extension signal line, 39 ... Jig, 41 ... Central control room, 43 ... Designation part, 47 ... Density derivation 48 (48a) ... corrector (density correction button), 49 ... density average part, 50 ... water pressure measuring instrument, 50 _(n) ... water pressure measuring instrument, 51 _(n) ... bubbler tube (water-immersed member), 52 ... extension Baburachubu, 53 _(n) ... measurement unit (running measurement _), L (n) ... depth difference, P _atm ... atmospheric pressure, P _(n) ... water pressure, P _w ... water pressure, [Delta] P ... differential pressure, σ _(n) ... density, sigma _ave ... average density.

Claims (10)

Three or more water pressure measuring devices fixed at different depths to the outer surface of the detector thrown into the stored liquid;
A density deriving unit for deriving two or more liquid densities based on a difference in measured water pressure measured by at least three of the water pressure measuring devices and a difference in water depth of the water pressure measuring device;
A density average unit for deriving an average density of the liquid by averaging two or more of the densities derived by the density deriving unit;
And a correction unit that corrects an indication value of the water level of the liquid based on the average density. The adjustment system of the throwing water level meter according to claim 1, wherein the water pressure measuring devices are fixed to the outer surface at equal intervals. The adjustment system of the pouring type water level meter according to claim 1 or 2, further comprising a calculation unit that calculates the density at a specific water depth from the relationship with the density at another water depth. The detector is
A pressure sensor that seals the end of the housing partly open to the liquid and receives water pressure;
The adjustment system of the pouring type water level meter according to any one of claims 1 to 3, further comprising a hollow cable connected to the inside of the casing and configured to send pressure to the pressure sensor from the outside of the liquid. . The adjustment system of the throwing-type water level meter according to claim 4, further comprising a designating unit that designates three or more water pressure measuring devices that actually measure the measured water pressure among all the water pressure measuring devices. The adjustment system of the throwing-type water level meter according to claim 5, further comprising a correction unit that corrects the indicated value of the water level based on the average density derived by the density average unit. The water pressure measuring instrument is
A bubbler tube having an open end fixed to the outer surface of the detector;
A measuring unit that pressurizes the bubbler tube to measure back pressure, and
The adjustment system of the pouring type water level meter according to any one of claims 1 to 6, wherein the measured water pressure is the back pressure. A throw-in type water level meter with an adjustment function, comprising the adjustment system according to any one of claims 1 to 7. Fixing three or more water pressure measuring devices at different water depths on the outer surface of the detector thrown into the stored liquid;
Deriving two or more densities of the liquid based on a difference between measured water pressures measured by at least three of the water pressure measuring devices and a difference in the water depth of the water pressure measuring devices;
Deriving an average density of the liquid by averaging two or more derived densities;
And a step of correcting an indication value of the water level of the liquid based on the average density. On the computer,
Fixing three or more water pressure measuring devices at different depths on the outer surface of the detector thrown into the stored liquid;
Deriving two or more liquid densities based on a difference between measured water pressures measured by at least three of the water pressure measuring devices and a difference in the water depth of the water pressure measuring devices;
Deriving an average density of the liquid by averaging two or more derived densities;
A program for adjusting the water level indicator of the pouring water level, wherein the step of correcting an indication value of the water level of the liquid based on the average density is executed.

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